Mechanism for threading the trailing yarn of a bobbin through an eye of a shuttle



J y 1964 EU! KONDO ETAL S MECHANISM FOR THREADING THE TRAILING YARN OF A B THROUGH AN EYE OF A SHUTTLE Filed April 5, 1962 OBBIN United States Patent MECHANISM FOR THREADING THE TRAILING YARN OF A BOBBIN THROUGH AN EYE OF A SHUTTLE Seiji Kondo and Rihei Nishikawa, Kariya, and Masaru Yoshida, Gifu, Japan, assignors to Toyoda Automatic lILoom Works, Ltd., Kariya, Japan, a corporation of apan Filed Apr. 3, 1962, Ser. No. 184,785 Claims priority, application Japan Apr. 5, 1961 Claims. (Cl. 139-259) This invention relates to a mechanism for threading the trailing yarn through an eye of the shuttle in an automatic loom of the cop-change type.

In a conventional automatic loom of the cop-change type equipped with a magazine loader, the weft replenishing operation is effected by changing bobbin instead of changing the shuttle as an entirety, allowing the operation of the same shuttle continued. Heretofore, no means is provided for threading the trailing yarn of the new bobbin at the time of the bobbin change, so that when the shuttle carrying the new bobbin makes the first run immediately after the bobbin changing operation the trailing yarn of the new bobbin is by no means threaded through the shuttle eye, and the threading is elfected only immediately before the second run of the shuttle. Under the circumstances, there would unavoidably be produced a difference of weft tension, whereby causing weaving defects.

The object of the present invention is to overcome the above mentioned disadvantage by providing an improved mechanism for threading the trailing yarn of the new bobbin at the time of bobbin changing operation before the shuttle makes the first run after the bobbin change, whereby enabling to always maintain the same relationship between the weft yarn and the running shuttle.

Other and further objects of the invention will be obvious upon an understanding of the illustrative embodiment about to be described, or will be indicated in the appended claims, and various advantages not referred to herein will occur to one skilled in the art upon employment of the invention in practice.

The accompanying drawing will serve to illustrate specific embodiment of the present invention, in order that its utility and functioning will be thoroughly appreciated. It will be understood, however, that this is by way of illustration only and is not to be taken as limiting the invention in any way. In the accompanying drawing:

FIGURE 1 shows a perspective view of a weft detector and a part of mechanism for transmitting the result of the weft detecting operation to the weft replenishing side of the loom;

FIGURE 2 shows a perspective view of the mechanism according to the present invention for threading the trailing yarn of the new bobbin at the time of bobbin change; and

FIGURE 3 is a side elevation of the shuttle in the position when the threading is effected.

Referring to the drawing, 1 designates a conventional weft detector normally reciprocating back and forth and having a feeler 1 which is adapted to swing in the direction of arrow upon detecting shortage of the weft yarn on a bobbin in a shuttle S. The weft detector 1 is connected by means of a rod or rigid wire 2 to an ear 3 secured to a pusher rod 4. The free end of the lower arm of a bellcrank lever 5 co-operates with a cam 6 fixed on a shaft 7 which rotates at the same r.p.m. of a tappet shaft of the loom, whereby the bellcrank lever 5 normally oscillates about a pivot 5. The upper arm of the bellcrank lever 5 has at its end a bent hook 8 which is adapted to engage with and push the ear 3 when the latter comes in the path of the hook 8 upon detecting the shortage of the yarn on the bobbin, whereby the pusher rod 4 will push an arm 9 fixed on a rod 10, so that the latter is rotated.

In FIGURE 2, a rod 11 which is connected to the rod 10 has three fixed arms 12, 13 and 14. A shaft 15 which rotates at the same r.p.m. of the tappet shaft has cams 16 and 17 which act upon levers 18 and 19, respectively, pivoted as at 18' and 19' respectively. Pivotally connected to said lever 18 there is a vertical rod 20 having at its upper end a hook 20, and pivotally connected to said lever 19 there is another vertical rod 21 having a hook 21, both rods 20 and 21 normally reciprocating vertically. A bobbin pushing lever 23 pivoted as at 23 is normally held in an elevated position by means of a spring s and has a depending hook 22. The arm 12 when swung inwardly engages with and pushes said depending hook 22 into the path of the hook 20' on the rod 20, so that upon the downward movement of the latter the lever 23 is lowered and serves to push a new bobbin into the shuttle S in place of the old bobbin.

A lever 25 pivoted as at 25 carries at its free end a yarn controller 26 which is normally held in an elevated position by means of a spring s The lever 25 has a depending hook 24 which when acted by the arm 14 comes into the path of the vertically reciprocating hook 21' of the rod 21, so that the lever 25 will be lowered, thereby the trailing yarn of the new bobbin is depressed by said yarn controller 26. A pair of scissors 27 normally held open is so connected with the lever 25 that upon downward movement of the lever 25 the trailing yarn is cut by said scissors. A suction pipe 29 is in communication with a source of vacuum (not shown) and, at its front mouth, the suction pipe opens toward an eye 30 of the shuttle. In said suction pipe 29 there is provided a yarn gripper 28 operatively connected with the lever 25 and adapted to be opened when said lever is lowered. When the scissors 27 is actuated upon the downward movement of the lever 25, the yarn is drawn through the eye 30 into the suction pipe 29, reaching the yarn gripper 28. Upon the return motion of the lever 25, the scissors 27 is opened and the yarn gripper 28 is closed to grip the yarn drawn into the suction pipe, thus completing the threading of the yarn through the shuttle eye 30. Another pair of scissors 31 actuated by the arm 13 is provided for the purpose of cutting the yarn trailed by the old bobbin.

In FIGURE 3, the yarn controller 26 is shown in its lowered position, depressing the trailing yarn. This controller 26 serves to bring the trailing yarn to a position in the vicinity of the shuttle eye 30. To establish a good chance of catching the yarn, the inner end of the shuttle eye 30 is preferably formed in the style of a bell mouth.

From the foregoing, it will be seen according to the present invention that the threading of the trailing yarn of the new bobbin is effected simultaneously with the bobbin changing operation, whereby preventing the formation of weaving defects caused by different weft tension.

What we claim is:

1. A mechanism for threading weft yarn through the eye of a shuttle in a weaving loom having a detector acting to feel a bobbin in a shuttle, and also having a conventional weft replenishing mechanism, said mechanism comprising a pivoted lever adapted to be operatively connected to the detector, a yarn controller on said pivoted lever and adapted to be lowered to engage and move the trailing yarn from a new bobbin inserted into the shuttle to a position in the vicinity of the shuttle eye, a pair of scissors connected to said lever and actuated by the downward movement of the latter, a suction pipe having one end opening toward the shuttle eye and adapted to be connected to a source of suction, and a yarn gripper operatively connected to said pivoted lever and associated with 4 said suction pipe and adapted to grip the yarn drawn through the shuttle eye into the suction pipe.

2. A mechanism as claimed in claim 1 in which said yarn gripper is positioned within said suction pipe adjacent the one end thereof.

References Cited in the file of this patent UNITED STATES PATENTS 1,214,868 Youngquist Feb. 6, 1917 1,989,067 Talbot Jan. 22, 1935 2,731,044 Schwabe Jan. 17, 1956 2,766,779 Goodhue et al Oct. 16, 1956 

1. A MECHANISM FOR THREADING WEFT YARN THROUGH THE EYE OF A SHUTTLE IN A WEAVING LOOM HAVING A DETECTOR ACTING TO FEEL A BOBBIN IN A SHUTTLE, AND ALSO HAVING A CONVENTIONAL WEFT REPLENISHING MECHANISM, SAID MECHANISM COMPRISING A PIVOTED LEVER ADAPTED TO BE OPERATIVELY CONNECTED TO THE DETECTOR, A YARN CONTROLLER ON SAID PIVOTED LEVER AND ADAPTED TO BE LOWERED TO ENGAGE AND MOVE THE TRAILING YARN FROM A NEW BOBBIN INSERTED INTO THE SHUTTLE TO A POSITION IN THE VICINITY OF THE SHUTTLE EYE, A PAIR OF SCISSORS CONNECTED TO SAID LEVER AND ACTUATED BY THE DOWNWARD MOVEMENT OF THE LATTER, A SUCTION PIPE HAVING ONE END OPENING TOWARD THE SHUTTLE EYE AND ADAPTED TO BE CONNECTED TO A SOURCE OF SUCTION, AND A YARN GRIPPER OPERATIVELY CONNECTED TO SAID PIVOTED LEVER AND ASSOCIATED WITH SAID SUCTION PIPE AND ADAPTED TO GRIP THE YARN DRAWN THROUGH THE SHUTTLE EYE INTO THE SUCTION PIPE. 